Since Demo VCO1 will always generate at least one channel of output, we can look at that output with the VCV Fundamental Scope without needing to make a patch which outputs audio.
Let's look at the different waveforms using Scope:
We can see some good things here. The basic shapes of all the waveforms look correct, with no obvious gaps, jumps, or other strangeness. The output voltage swings between +5V and -5V as desired (except the crazy parabolic - more on that later).
Now let's check out the tuning. First - with no input (zero volts) the VCV spec says we should put out a frequency which is equivalent to a musical note at a pitch of C4, also known as Middle C.
Here we are using NYSTHI Hot Tuna to check the pitch:
Now, let's see if Demo VCO1's sine wave tracks at 1V/Octave like it's supposed to. Here we again use Hot Tuna to check the pitch, VCV MIDI-CV to generate precise voltages, and NYSTHI MultiVoltimetro to display the voltage.
We see that the pitch changes by an octave when the CV changes by a volt.
So far, it looks like Demo VCO1 is working perfectly, but in our next session we will dig a little deeper and find some pretty bad flaws in how it works.
The next page discusses CPU consumption.